Transmission configuration indicator determination for mixed mode operation

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a transmission type for a physical downlink shared channel, wherein the transmission type is a multicast transmission type or a unicast transmission type. The UE may determine, based at least in part on the transmission type for the physical downlink shared channel, a transmission configuration indicator state, of a plurality of possible transmission configuration indicator states, that corresponds to a quasi-co-location assumption, of a plurality of possible quasi-co-location assumptions, for the physical downlink shared channel. The UE may decode the physical downlink shared channel based at least in part on the transmission configuration indicator state. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This Patent Application is a continuation of U.S. patent applicationSer. No. 16/947,138, filed Jul. 20, 2020 (now U.S. Pat. No. 11,382,126),entitled “TRANSMISSION CONFIGURATION INDICATOR DETERMINATION FOR MIXEDMODE OPERATION,” which claims priority to U.S. Provisional PatentApplication No. 62/882,381, filed on Aug. 2, 2019, entitled“TRANSMISSION CONFIGURATION INDICATOR DETERMINATION FOR MIXED MODEOPERATION,” the contents of which are incorporated herein by referencein their entireties.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for transmissionconfiguration indicator determination for mixed mode operation.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by a userequipment (UE), may include determining a transmission type for aphysical downlink shared channel, wherein the transmission type is amulticast transmission type or a unicast transmission type; determining,based at least in part on the transmission type for the physicaldownlink shared channel, a transmission configuration indicator state,of a plurality of possible transmission configuration indicator states,that corresponds to a quasi-co-location assumption, of a plurality ofpossible quasi-co-location assumptions, for the physical downlink sharedchannel; and decoding the physical downlink shared channel based atleast in part on the transmission configuration indicator state.

In some aspects, a UE for wireless communication may include memory andone or more processors coupled with the memory. The memory and the oneor more processors may be configured to determine a transmission typefor a physical downlink shared channel, wherein the transmission type isa multicast transmission type or a unicast transmission type; determine,based at least in part on the transmission type for the physicaldownlink shared channel, a transmission configuration indicator state,of a plurality of possible transmission configuration indicator states,that corresponds to a quasi-co-location assumption, of a plurality ofpossible quasi-co-location assumptions, for the physical downlink sharedchannel; and decode the physical downlink shared channel based at leastin part on the transmission configuration indicator state.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a UE, may causethe one or more processors to determine a transmission type for aphysical downlink shared channel, wherein the transmission type is amulticast transmission type or a unicast transmission type; determine,based at least in part on the transmission type for the physicaldownlink shared channel, a transmission configuration indicator state,of a plurality of possible transmission configuration indicator states,that corresponds to a quasi-co-location assumption, of a plurality ofpossible quasi-co-location assumptions, for the physical downlink sharedchannel; and decode the physical downlink shared channel based at leastin part on the transmission configuration indicator state.

In some aspects, an apparatus for wireless communication may includemeans for determining a transmission type for a physical downlink sharedchannel, wherein the transmission type is a multicast transmission typeor a unicast transmission type; means for determining, based at least inpart on the transmission type for the physical downlink shared channel,a transmission configuration indicator state, of a plurality of possibletransmission configuration indicator states, that corresponds to aquasi-co-location assumption, of a plurality of possiblequasi-co-location assumptions, for the physical downlink shared channel;and means for decoding the physical downlink shared channel based atleast in part on the transmission configuration indicator state.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe accompanying drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a block diagram conceptually illustrating an example of awireless communication network, in accordance with various aspects ofthe present disclosure.

FIG. 2 is a block diagram conceptually illustrating an example of a basestation in communication with a UE in a wireless communication network,in accordance with various aspects of the present disclosure.

FIG. 3A is a block diagram conceptually illustrating an example of aframe structure in a wireless communication network, in accordance withvarious aspects of the present disclosure.

FIG. 3B is a block diagram conceptually illustrating an examplesynchronization communication hierarchy in a wireless communicationnetwork, in accordance with various aspects of the present disclosure.

FIG. 4 is a block diagram conceptually illustrating an example slotformat with a normal cyclic prefix, in accordance with various aspectsof the present disclosure.

FIG. 5 illustrates an example logical architecture of a distributedradio access network (RAN), in accordance with various aspects of thepresent disclosure.

FIG. 6 illustrates an example physical architecture of a distributedRAN, in accordance with various aspects of the present disclosure.

FIG. 7 is a diagram illustrating an example of transmissionconfiguration indicator determination for mixed mode operation, inaccordance with various aspects of the present disclosure.

FIG. 8 is a diagram illustrating an example process performed, forexample, by a user equipment, in accordance with various aspects of thepresent disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based at least inpart on the teachings herein one skilled in the art should appreciatethat the scope of the disclosure is intended to cover any aspect of thedisclosure disclosed herein, whether implemented independently of orcombined with any other aspect of the disclosure. For example, anapparatus may be implemented or a method may be practiced using anynumber of the aspects set forth herein. In addition, the scope of thedisclosure is intended to cover such an apparatus or method which ispracticed using other structure, functionality, or structure andfunctionality in addition to or other than the various aspects of thedisclosure set forth herein. It should be understood that any aspect ofthe disclosure disclosed herein may be embodied by one or more elementsof a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110d) and other networkentities. A BS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). A BS for a macro cell may bereferred to as a macro BS. A BS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1, a BS 110 a may be a macro BSfor a macro cell 102a, a BS 110b may be a pico BS for a pico cell 102b,and a BS 110 c may be a femto BS for a femto cell 102c. A BS may supportone or multiple (e.g., three) cells. The terms “eNB”, “base station”,“NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” may be usedinterchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1, a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

0097-0948C1

UEs 120 (e.g., 120 a, 120 b, 120 c, 120 d, 120 e) may be dispersedthroughout wireless network 100, and each UE may be stationary ormobile. A UE may also be referred to as an access terminal, a terminal,a mobile station, a subscriber unit, a station, and/or the like. A UEmay be a cellular phone (e.g., a smart phone), a personal digitalassistant (PDA), a wireless modem, a wireless communication device, ahandheld device, a laptop computer, a cordless phone, a wireless localloop (WLL) station, a tablet, a camera, a gaming device, a netbook, asmartbook, an ultrabook, a medical device or equipment, biometricsensors/devices, wearable devices (smart watches, smart clothing, smartglasses, smart wrist bands, smart jewelry (e.g., smart ring, smartbracelet)), an entertainment device (e.g., a music or video device, or asatellite radio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular RAT andmay operate on one or more frequencies. A RAT may also be referred to asa radio technology, an air interface, and/or the like. A frequency mayalso be referred to as a carrier, a frequency channel, and/or the like.Each frequency may support a single RAT in a given geographic area inorder to avoid interference between wireless networks of different RATs.In some cases, NR or 5G RAT networks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1.

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1.Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with transmission configuration indicatordetermination for mixed mode operation, as described in more detailelsewhere herein. For example, controller/processor 240 of base station110, controller/processor 280 of UE 120, and/or any other component(s)of FIG. 2 may perform or direct operations of, for example, process 800of FIG. 8 and/or other processes as described herein. Memories 242 and282 may store data and program codes for base station 110 and UE 120,respectively. In some aspects, memory 242 and/or memory 282 may comprisea non-transitory computer-readable medium storing one or moreinstructions for wireless communication. For example, the one or moreinstructions, when executed by one or more processors of the basestation 110 and/or the UE 120, may perform or direct operations of, forexample, process 800 of FIG. 8 and/or other processes as describedherein. A scheduler 246 may schedule UEs for data transmission on thedownlink and/or uplink.

In some aspects, UE 120 may include means for determining a transmissiontype for a physical downlink shared channel, wherein the transmissiontype is a multicast transmission type or a unicast transmission type,means for determining, based at least in part on the transmission typefor the physical downlink shared channel, a transmission configurationindicator state, of a plurality of possible transmission configurationindicator states, that corresponds to a quasi-co-location assumption, ofa plurality of possible quasi-co-location assumptions, for the physicaldownlink shared channel, means for decoding the physical downlink sharedchannel based at least in part on the transmission configurationindicator state, and/or the like. In some aspects, such means mayinclude one or more components of UE 120 described in connection withFIG. 2, such as controller/processor 280, transmit processor 264, TXMIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256,receive processor 258, and/or the like.

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2.

FIG. 3A shows an example frame structure 300 for frequency divisionduplexing (FDD) in a telecommunications system (e.g., NR). Thetransmission timeline for each of the downlink and uplink may bepartitioned into units of radio frames (sometimes referred to asframes). Each radio frame may have a predetermined duration (e.g., 10milliseconds (ms)) and may be partitioned into a set of Z (Z≥1)subframes (e.g., with indices of 0 through Z−1). Each subframe may havea predetermined duration (e.g., 1 ms) and may include a set of slots(e.g., 2^(m) slots per subframe are shown in FIG. 3A, where m is anumerology used for a transmission, such as 0, 1, 2, 3, 4, and/or thelike). Each slot may include a set of L symbol periods. For example,each slot may include fourteen symbol periods (e.g., as shown in FIG.3A), seven symbol periods, or another number of symbol periods. In acase where the subframe includes two slots (e.g., when m=1), thesubframe may include 2L symbol periods, where the 2L symbol periods ineach subframe may be assigned indices of 0 through 2L−1. In someaspects, a scheduling unit for the FDD may be frame-based,subframe-based, slot-based, symbol-based, and/or the like.

While some techniques are described herein in connection with frames,subframes, slots, and/or the like, these techniques may equally apply toother types of wireless communication structures, which may be referredto using terms other than “frame,” “subframe,” “slot,” and/or the likein 5G NR. In some aspects, a wireless communication structure may referto a periodic time-bounded communication unit defined by a wirelesscommunication standard and/or protocol. Additionally, or alternatively,different configurations of wireless communication structures than thoseshown in FIG. 3A may be used.

In certain telecommunications (e.g., NR), a base station may transmitsynchronization signals. For example, a base station may transmit aprimary synchronization signal (PSS), a secondary synchronization signal(SSS), and/or the like, on the downlink for each cell supported by thebase station. The PSS and SSS may be used by UEs for cell search andacquisition. For example, the PSS may be used by UEs to determine symboltiming, and the SSS may be used by UEs to determine a physical cellidentifier, associated with the base station, and frame timing. The basestation may also transmit a physical broadcast channel (PBCH). The PBCHmay carry some system information, such as system information thatsupports initial access by UEs.

In some aspects, the base station may transmit the PSS, the SSS, and/orthe PBCH in accordance with a synchronization communication hierarchy(e.g., a synchronization signal (SS) hierarchy) including multiplesynchronization communications (e.g., SS blocks), as described below inconnection with FIG. 3B.

FIG. 3B is a block diagram conceptually illustrating an example SShierarchy, which is an example of a synchronization communicationhierarchy. As shown in FIG. 3B, the SS hierarchy may include an SS burstset, which may include a plurality of SS bursts (identified as SS burst0 through SS burst B-1, where B is a maximum number of repetitions ofthe SS burst that may be transmitted by the base station). As furthershown, each SS burst may include one or more SS blocks (identified as SSblock 0 through SS block (b_(max_SS)-1), where b_(max_SS)-1 is a maximumnumber of SS blocks that can be carried by an SS burst). In someaspects, different SS blocks may be beam-formed differently. An SS burstset may be periodically transmitted by a wireless node, such as every Xmilliseconds, as shown in FIG. 3B. In some aspects, an SS burst set mayhave a fixed or dynamic length, shown as Y milliseconds in FIG. 3B.

The SS burst set shown in FIG. 3B is an example of a synchronizationcommunication set, and other synchronization communication sets may beused in connection with the techniques described herein. Furthermore,the SS block shown in FIG. 3B is an example of a synchronizationcommunication, and other synchronization communications may be used inconnection with the techniques described herein.

In some aspects, an SS block includes resources that carry the PSS, theSSS, the PBCH, and/or other synchronization signals (e.g., a tertiarysynchronization signal (TSS)) and/or synchronization channels. In someaspects, multiple SS blocks are included in an SS burst, and the PSS,the SSS, and/or the PBCH may be the same across each SS block of the SSburst. In some aspects, a single SS block may be included in an SSburst. In some aspects, the SS block may be at least four symbol periodsin length, where each symbol carries one or more of the PSS (e.g.,occupying one symbol), the SSS (e.g., occupying one symbol), and/or thePBCH (e.g., occupying two symbols).

In some aspects, the symbols of an SS block are consecutive, as shown inFIG. 3B. In some aspects, the symbols of an SS block arenon-consecutive. Similarly, in some aspects, one or more SS blocks ofthe SS burst may be transmitted in consecutive radio resources (e.g.,consecutive symbol periods) during one or more slots. Additionally, oralternatively, one or more SS blocks of the SS burst may be transmittedin non-consecutive radio resources.

In some aspects, the SS bursts may have a burst period, whereby the SSblocks of the SS burst are transmitted by the base station according tothe burst period. In other words, the SS blocks may be repeated duringeach SS burst. In some aspects, the SS burst set may have a burst setperiodicity, whereby the SS bursts of the SS burst set are transmittedby the base station according to the fixed burst set periodicity. Inother words, the SS bursts may be repeated during each SS burst set.

The base station may transmit system information, such as systeminformation blocks (SIBs) on a physical downlink shared channel (PDSCH)in certain slots. The base station may transmit control information/dataon a physical downlink control channel (PDCCH) in C symbol periods of aslot, where B may be configurable for each slot. The base station maytransmit traffic data and/or other data on the PDSCH in the remainingsymbol periods of each slot.

As indicated above, FIGS. 3A and 3B are provided as examples. Otherexamples may differ from what is described with regard to FIGS. 3A and3B.

FIG. 4 shows an example slot format 410 with a normal cyclic prefix. Theavailable time frequency resources may be partitioned into resourceblocks. Each resource block may cover a set of subcarriers (e.g., 12subcarriers) in one slot and may include a number of resource elements.Each resource element may cover one subcarrier in one symbol period(e.g., in time) and may be used to send one modulation symbol, which maybe a real or complex value.

An interlace structure may be used for each of the downlink and uplinkfor FDD in certain telecommunications systems (e.g., NR). For example, Qinterlaces with indices of 0 through Q−1 may be defined, where Q may beequal to 4, 6, 8, 10, or some other value. Each interlace may includeslots that are spaced apart by Q frames. In particular, interlace q mayinclude slots q, q+Q, q+2Q, etc., where q ∈ {0, . . . , Q−1}.

A UE may be located within the coverage of multiple BSs. One of theseBSs may be selected to serve the UE. The serving BS may be selectedbased at least in part on various criteria such as received signalstrength, received signal quality, path loss, and/or the like. Receivedsignal quality may be quantified by a signal-to-noise-and-interferenceratio (SNIR), or a reference signal received quality (RSRQ), or someother metric. The UE may operate in a dominant interference scenario inwhich the UE may observe high interference from one or more interferingBSs.

While aspects of the examples described herein may be associated with NRor 5G technologies, aspects of the present disclosure may be applicablewith other wireless communication systems. New Radio (NR) may refer toradios configured to operate according to a new air interface (e.g.,other than Orthogonal Frequency Divisional Multiple Access (OFDMA)-basedair interfaces) or fixed transport layer (e.g., other than InternetProtocol (IP)). In aspects, NR may utilize OFDM with a CP (hereinreferred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on theuplink, may utilize CP-OFDM on the downlink and include support forhalf-duplex operation using time division duplexing (TDD). In aspects,NR may, for example, utilize OFDM with a CP (herein referred to asCP-OFDM) and/or discrete Fourier transform spread orthogonalfrequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilizeCP-OFDM on the downlink and include support for half-duplex operationusing TDD. NR may include Enhanced Mobile Broadband (eMBB) servicetargeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond),millimeter wave (mmW) targeting high carrier frequency (e.g., 60gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatibleMTC techniques, and/or mission critical targeting ultra reliable lowlatency communications (URLLC) service.

In some aspects, a single component carrier bandwidth of 100 MHz may besupported. NR resource blocks may span 12 sub-carriers with asub-carrier bandwidth of 60 or 120 kilohertz (kHz) over a 0.1millisecond (ms) duration. Each radio frame may include 40 slots and mayhave a length of 10 ms. Consequently, each slot may have a length of0.25 ms. Each slot may indicate a link direction (e.g., DL or UL) fordata transmission and the link direction for each slot may bedynamically switched. Each slot may include DL/UL data as well as DL/ULcontrol data.

Beamforming may be supported and beam direction may be dynamicallyconfigured. MIMO transmissions with precoding may also be supported.MIMO configurations in the DL may support up to 8 transmit antennas withmulti-layer DL transmissions up to 8 streams and up to 2 streams per UE.Multi-layer transmissions with up to 2 streams per UE may be supported.Aggregation of multiple cells may be supported with up to 8 servingcells. Alternatively, NR may support a different air interface, otherthan an OFDM-based interface. NR networks may include entities such ascentral units or distributed units.

As indicated above, FIG. 4 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 4.

FIG. 5 illustrates an example logical architecture of a distributed RAN500, according to aspects of the present disclosure. A 5G access node506 may include an access node controller (ANC) 502. The ANC may be acentral unit (CU) of the distributed RAN 500. The backhaul interface tothe next generation core network (NG-CN) 504 may terminate at the ANC.The backhaul interface to neighboring next generation access nodes(NG-ANs) may terminate at the ANC. The ANC may include one or more TRPs508 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs,gNB, or some other term). As described above, “TRP” may be usedinterchangeably with “cell.”

The TRPs 508 may be a distributed unit (DU). The TRPs may be connectedto one ANC (ANC 502) or more than one ANC (not illustrated). Forexample, for RAN sharing, radio as a service (RaaS), and servicespecific AND deployments, the TRP may be connected to more than one ANC.A TRP may include one or more antenna ports. The TRPs may be configuredto individually (e.g., dynamic selection) or jointly (e.g., jointtransmission) serve traffic to a UE.

The local architecture of RAN 500 may be used to illustrate fronthaulcommunication. The architecture may be defined to support fronthaulingsolutions across different deployment types. For example, thearchitecture may be based at least in part on transmit networkcapabilities (e.g., bandwidth, latency, and/or jitter).

The architecture may share features and/or components with LTE.According to aspects, the next generation AN (NG-AN) 510 may supportdual connectivity with NR. The NG-AN may share a common fronthaul forLTE and NR.

The architecture may enable cooperation between and among TRPs 508. Forexample, cooperation may be preset within a TRP and/or across TRPs viathe ANC 502. According to aspects, no inter-TRP interface may beneeded/present.

According to aspects, a dynamic configuration of split logical functionsmay be present within the architecture of RAN 500. The packet dataconvergence protocol (PDCP), radio link control (RLC), or medium accesscontrol (MAC) protocol may be adaptably placed at the ANC or TRP.

According to various aspects, a BS may include a central unit (CU)(e.g., ANC 502) and/or one or more distributed units (e.g., one or moreTRPs 508).

As indicated above, FIG. 5 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 5.

FIG. 6 illustrates an example physical architecture of a distributed RAN600, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 602 may host core network functions. The C-CU may becentrally deployed. C-CU functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 604 may host one or more ANC functions.Optionally, the C-RU may host core network functions locally. The C-RUmay have distributed deployment. The C-RU may be closer to the networkedge.

A distributed unit (DU) 606 may host one or more TRPs. The DU may belocated at edges of the network with radio frequency (RF) functionality.

As indicated above, FIG. 6 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 6.

Some communications systems, such as NR, allow mixed mode operation. Forexample, a BS may be configured to transmit, in some cases, a unicasttransmission, and in other cases a multicast transmission. A UE may usean assumption of a quasi-co-location (QCL) property to decode atransmission from the BS, where the assumption of a QCL property of atransmission is identified based on a set of implicit rules or anexplicit configuration. For example, if a UE does not store aconfiguration for determining a QCL assumption of a transmission, thenthe UE may determine that transmission has the same QCL property with aparticular reference signal (RS). Additionally, or alternatively, if aUE does store a configuration for determining a QCL assumption of atransmission, the UE may determine that the transmission has the sameQCL property as a particular RS.

The configuration providing QCL assumption may be a transmissionconfiguration indicator (TCI) state. Each TCI state has informationidentifying one or two RSs (e.g., which may be a specifiedsynchronization signal block (SSB) or channel state informationreference signal (CSI-RS)) and a type of the QCL property for each RS(e.g., information identifying a QCL relationship in terms of Dopplershift, Doppler spread, average delay, delay spread, and/or Spatial Rxparameter).

However, different transmissions may be associated with different RSsthat may require different QCL assumptions. For example, a multicasttransmission may be quasi-co-located with at least in part on acell-defining SSB, while a unicast transmission may be quasi-co-locatedwith at least in part on a CSI-RS resource that is configured formonitoring by UE-specific higher layer signaling. Similarly, a QCLsource (e.g., one or more SSBs or CSI-RSs with the same QCL properties)for a multicast transmission may be based at least in part on a CSI-RSresource that is transmitted across a plurality of cells (e.g.,transmitted over a wide area across multiple transmit receive points(TRPs)) in a synchronous manner; but, a QCL source for a unicasttransmission may be based at least in part on a CSI-RS resource that istransmitted only in a single cell (e.g., transmitted over a particulararea covered by a TRP). Similarly, a beam width may be relatively widefor multicast transmission and relatively narrow for unicasttransmission, in which case associated QCL properties maybe different.

Further, for a given multicast service, a plurality of assumptions ofQCL properties may be possible. For example, a QCL assumption for aphysical downlink control channel (PDCCH) that schedules a multicastdata transmission may be based at least in part on a cell-defining SSB,but a QCL assumption for the multicast data transmission (e.g., aphysical downlink shared channel (PDSCH)) scheduled by the PDCCH may bebased at least in part on a UE-specific CSI-RS. Similarly, a QCL sourcefor a PDCCH may be based at least in part on a multi-cell common CSI-RSresource, but a QCL source for a PDSCH may be based at least in part ona single-cell CSI-RS. Similarly, a beam width for a PDCCH may berelatively wide and a beam width for a PDSCH may be relatively narrow.

For a PDSCH, the QCL property may be the same as that for the controlresource set (CORESET) in which a corresponding PDCCH is received, for aCORESET that has a lowest index value in a latest slot where a searchspace is monitored, or for a value that is indicated by a transmissionconfiguration indicator (TCI) state of a downlink control information(DCI) message.

Thus, some aspects described herein enable TCI determination for mixedmode operation. For example, a UE may determine a transmission type fora PDSCH, may determine a TCI state based at least in part on thetransmission type, and may decode the PDSCH based at least in part onthe TCI state. In this case, based at least in part on determining theTCI state, the UE may determine a configuration for QCL property thatmay include a QCL assumption, a QCL source, a beam width, and/or thelike. In this way, the UE enables decoding of a PDSCH. For example, theUE may assume that a PDSCH is quasi-co-located with a reference signalassociated with the QCL information identified by a TCI state for thePDSCH. In this way, the UE enables decoding of transmissions from a BSin mixed mode operation.

FIG. 7 is a diagram illustrating an example 700 of transmissionconfiguration indicator determination for mixed mode operation, inaccordance with various aspects of the present disclosure. As shown inFIG. 7, example 700 includes a BS 110 and a UE 120.

As further shown in FIG. 7, and by reference number 710, UE 120 mayreceive a transmission from BS 110. For example, UE 120 may receive thePDSCH transmission from BS 110. In some aspects, the transmission may bea particular transmission type. For example, UE 120 may receive aunicast PDSCH transmission, a multicast PDSCH transmission, and/or thelike. In some aspects, the transmission may be associated with aparticular scrambling configuration. For example, UE 120 may receive aPDSCH transmission with a cyclic redundancy check (CRC) scrambled usinga particular type of radio network temporary identifier (RNTI), asdescribed in more detail herein. In some aspects, the transmission maybe scheduled by another transmission. For example, UE 120 may receivePDCCH transmission scheduling resources for the PDSCH transmission, andmay subsequently receive the PDSCH transmission using the resourcesscheduled for the PDSCH transmission.

As further shown in FIG. 7, and by reference number 720, UE 120 maydetermine a transmission type and an associated TCI state and/orassociated QCL assumption. For example, UE 120 may determine that thetransmission is a multicast PDSCH transmission and is associated with afirst TCI state, a first QCL assumption, and/or the like. Additionally,or alternatively, UE 120 may determine that the transmission is aunicast PDSCH transmission and is associated with a second TCI state, asecond QCL assumption, and/or the like.

In some aspects, UE 120 may determine that the transmission is a unicastPDSCH based at least in part on use of a particular scramblingconfiguration associated with an RNTI. For example, UE 120 may determinethat a unicast PDSCH has a CRC that is scrambled based at least in parton a cell RNTI (C-RNTI), a configured scheduling RNTI (CS-RNTI), amodulation and coding scheme (MCS) C-RNTI (MCS-C-RNTI), and/or the like.Additionally, or alternatively, UE 120 may determine that thetransmission is a unicast PDSCH based at least in part on thetransmission being scheduled by a PDCCH with a CRC that is scrambled bya C-RNTI, a CS-RNTI, an MCS-C-RNTI, and/or the like.

In some aspects, UE 120 may determine that the transmission is amulticast PDSCH based at least in part on use of a group RNTI (G-RNTI)to scramble the transmission. Additionally, or alternatively, UE 120 maydetermine that the transmission is a multicast PDSCH based at least inpart on the transmission being scheduled by a PDCCH with a CRC that isscrambled by a G-RNTI. In this case, BS 110 may configure the G-RNTI fora group of UEs, including UE 120, that receive the same PDSCH and havethe same higher-layer configuration.

In some aspects, UE 120 may determine a TCI state, which may correspondto a QCL assumption, for the transmission based at least in part on anindicator. For example, UE 120 may determine that a DCI in a CORESETindicates the TCI state for a unicast transmission, a multicasttransmission, and/or the like. In this case, BS 110 may configure theDCI for both the unicast transmission and the multicast transmission.Additionally, or alternatively, UE 120 may determine the TCI state basedat least in part on a DCI, in a CORESET, that is configured separatelyfor a unicast transmission (e.g., a first DCI) and a multicasttransmission (e.g., a second DCI). In this case, based at least in parton determining the type of the transmission, UE 120 may determine theTCI state based at least in part on the DCI.

In some aspects, UE 120 may select the TCI state from a TCI state pool.For example, UE 120 may determine an association between a schedulingDCI and a TCI state of a TCI state pool configured in a PDSCHconfiguration message. In this case, UE 120 may determine the sameassociation to the same TCI state for a multicast transmission and for aunicast transmission. For example, UE 120 may determine that a TCI stateindex identifies a particular TCI state in the TCI state pool.Additionally, or alternatively, UE 120 may use a first association to afirst TCI state for a multicast transmission and a second association toa second TCI state for a unicast transmission.

In some aspects, UE 120 may use different TCI state pools for differenttypes of transmissions. For example, a connected mode UE 120 maydetermine the TCI state pool for a multicast transmission based at leastin part on a UE-specific radio resource control (RRC) message (e.g., ina PDSCH configuration message). Alternatively, an idle mode UE 120, aninactive mode UE 120, or a connected mode UE 120 may determine the TCIstate pool for a unicast transmission based at least in part on aUE-common RRC message.

In some aspects, UE 120 may determine to activate or deactivate a TCIstate. For example, UE 120 may receive a medium access control (MAC)control element (CE) to activate a set of TCI states from which toselect a TCI state for multicast transmissions and unicasttransmissions. Additionally, or alternatively, UE 120 may receive afirst MAC CE to activate TCI states for selection for multicasttransmissions and a second MAC CE to activate TCI states for selectionfor unicast transmissions. In this case, UE 120 may select from aparticular quantity of activated TCI states that may be determined basedat least in part on a quantity of bits reserved for activating and/ordeactivating TCI states. For example, based at least in part on thequantity of bits in a signaling message, BS 110 may configure a maximumquantity of concurrently active TCI states (e.g., 8 TCI states, 16 TCIstates, 64 TCI states, and/or the like). In some aspects, the maximumquantity may be selected based at least in part on a UE capability, andUE 120 may report the UE capability to BS 110 to cause BS 110 toactivate a quantity of TCI states that is less than or equal to themaximum quantity of TCI states.

In some aspects, UE 120 may determine the TCI state without receiving ascheduling DCI from BS 110 (e.g., based at least in part on transmissionof the scheduling DCI not being available or not being enabled). Forexample, UE 120 may determine the TCI state for a current slot based atleast in part on whether a monitored search space in a previous slot isfor multicast (e.g., a common search space (CSS) with a C-RNTI or aUE-specific search space (USS)) or unicast (e.g., a master search space(MSS) or a search space with a G-RNTI). Additionally, or alternatively,when a search space for multicast and a search space for unicast aremonitored, UE 120 may determine the TCI state based at least in part ona QCL assumption of a CORESET with a lowest index in a most recent slotwith a search space for unicast, a most recent slot with a search spacefor multicast, or any most recent slot.

As further shown in FIG. 7, and by reference number 730, UE 120 maydecode the PDSCH transmission. For example, UE 120 may decode the PDSCHtransmission based at least in part on the TCI state, the QCLassumption, and/or the like of the PDSCH transmission. In this way, UE120 may decode PDSCH transmissions in mixed mode operation.

As indicated above, FIG. 7 is provided as an example. Other examples maydiffer from what is described with respect to FIG. 7.

FIG. 8 is a diagram illustrating an example process 800 performed, forexample, by a UE, in accordance with various aspects of the presentdisclosure. Example process 800 is an example where a UE (e.g., UE 120and/or the like) performs operations associated with transmissionconfiguration indicator determination for mixed mode operation.

As shown in FIG. 8, in some aspects, process 800 may include determininga transmission type for a physical downlink shared channel, wherein thetransmission type is a multicast transmission type or a unicasttransmission type (block 810). For example, the UE (e.g., using receiveprocessor 258, transmit processor 264, controller/processor 280, memory282, and/or the like) may determine a transmission type for a physicaldownlink shared channel, as described above. In some aspects, thetransmission type is a multicast transmission type or a unicasttransmission type.

As further shown in FIG. 8, in some aspects, process 800 may includedetermining, based at least in part on the transmission type for thephysical downlink shared channel, a transmission configuration indicatorstate, of a plurality of possible transmission configuration indicatorstates, that corresponds to a quasi-co-location assumption, of aplurality of possible quasi-co-location assumptions, for the physicaldownlink shared channel (block 820). For example, the UE (e.g., usingreceive processor 258, transmit processor 264, controller/processor 280,memory 282, and/or the like) may determine, based at least in part onthe transmission type for the physical downlink shared channel, atransmission configuration indicator state, of a plurality of possibletransmission configuration indicator states, that corresponds to aquasi-co-location assumption, of a plurality of possiblequasi-co-location assumptions, for the physical downlink shared channel,as described above.

As further shown in FIG. 8, in some aspects, process 800 may includedecoding the physical downlink shared channel based at least in part onthe transmission configuration indicator state (block 830). For example,the UE (e.g., using receive processor 258, transmit processor 264,controller/processor 280, memory 282, and/or the like) may decode thephysical downlink shared channel based at least in part on thetransmission configuration indicator state, as described above.

Process 800 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, determining the transmission type includesdetermining the transmission type based at least in part on a type ofscrambling identifier for a cyclic redundancy check of the physicaldownlink shared channel or a type of scrambling identifier for a cyclicredundancy check of a physical downlink control channel scheduling thephysical downlink shared channel.

In a second aspect, alone or in combination with the first aspect,determining the transmission configuration indicator state includesdetermining the transmission configuration indicator state based atleast in part on a downlink control information parameter.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the downlink control information parameter is acommon parameter for a control resource set that is effective for themulticast transmission type and the unicast transmission type.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the downlink control information parameteris a transmission type-specific parameter for a control resource setthat is effective for the multicast transmission type or the unicasttransmission type.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the downlink control information parameter has,for the multicast transmission type and the unicast transmission type, asingle association to a transmission configuration indicator state indexin a transmission configuration indicator state pool, which is for themulticast transmission type and the unicast transmission type.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the downlink control information parameter has,for the multicast transmission type, a first association to a firsttransmission configuration indicator state index in a transmissionconfiguration indicator state pool, which is for the multicasttransmission type and the unicast transmission type, and, for theunicast transmission type, a second association to a second transmissionconfiguration indicator state index in the transmission configurationindicator state pool.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the downlink control information parameteridentifies the transmission configuration indicator state from atransmission configuration indicator state pool that is configured forthe multicast transmission type, based at least in part on a UE-specificradio resource control signal.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the downlink control informationparameter identifies the transmission configuration indicator state froma transmission configuration indicator state pool that is configured forthe multicast transmission type, based at least in part on a UE-commonradio resource control signal.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, a MAC CE parameter identifies, for the unicasttransmission type and the multicast transmission type, a single set oftransmission configuration indicator states of a transmissionconfiguration indicator state pool configured for the multicasttransmission type and the unicast transmission type.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, a MAC CE parameter identifies, for the unicasttransmission type, a first set of transmission configuration indicatorstates and, for the multicast transmission type, a second set oftransmission configuration indicator states of a transmissionconfiguration indicator state pool configured for the multicasttransmission type and the unicast transmission type.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, a MAC CE parameter identifies thetransmission configuration indicator state from a transmissionconfiguration indicator state pool that is configured for the multicasttransmission type, based at least in part on a UE-specific radioresource control signal.

In a twelfth aspect, alone or in combination with one or more of thefirst through eleventh aspects, a MAC CE parameter identifies thetransmission configuration indicator state from a transmissionconfiguration indicator state pool that is configured for the multicasttransmission type, based at least in part on a UE-common radio resourcecontrol signal.

In a thirteenth aspect, alone or in combination with one or more of thefirst through twelfth aspects, process 800 includes reporting a UEcapability corresponding to a maximum quantity of active transmissionconfiguration indicator states; and determining a set of activetransmission configuration indicator states from which to select thetransmission configuration indicator state, based at least in part onreporting the UE capability.

In a fourteenth aspect, alone or in combination with one or more of thefirst through thirteenth aspects, determining the transmissionconfiguration indicator state includes determining the transmissionconfiguration indicator state in a current slot based at least in parton a type of transmission for which a search space is configured in aprevious slot.

In a fifteenth aspect, alone or in combination with one or more of thefirst through fourteenth aspects, determining the transmissionconfiguration indicator state includes determining the transmissionconfiguration indicator state in a current slot based at least in parton a control resource set quasi-co-location parameter for the previousslot.

Although FIG. 8 shows example blocks of process 800, in some aspects,process 800 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 8.Additionally, or alternatively, two or more of the blocks of process 800may be performed in parallel.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A method of wireless communication performed by auser equipment (UE), comprising: determining a transmission type for aphysical downlink shared channel, wherein the transmission type is amulticast transmission type or a unicast transmission type; determining,based at least in part on the transmission type, for the physicaldownlink shared channel, and a downlink control information parameter, atransmission configuration indicator state, of a plurality of possibletransmission configuration indicator states, that corresponds to aquasi-co-location assumption, of a plurality of possiblequasi-co-location assumptions, for the physical downlink shared channel;and decoding the physical downlink shared channel based at least in parton the transmission configuration indicator state.
 2. The method ofclaim 1, wherein determining the transmission type comprises:determining the transmission type based at least in part on: a type ofscrambling identifier for a cyclic redundancy check of the physicaldownlink shared channel, or a type of scrambling identifier for a cyclicredundancy check of a physical downlink control channel scheduling thephysical downlink shared channel.
 3. The method of claim 1, wherein thedownlink control information parameter is a common parameter for acontrol resource set that is effective for the multicast transmissiontype and the unicast transmission type.
 4. The method of claim 1,wherein the downlink control information parameter is a transmissiontype-specific parameter for a control resource set that is effective forthe multicast transmission type or the unicast transmission type.
 5. Themethod of claim 1, wherein the downlink control information parameterhas, for the multicast transmission type and the unicast transmissiontype, a single association to a transmission configuration indicatorstate index in a transmission configuration indicator state pool, whichis for the multicast transmission type and the unicast transmissiontype.
 6. The method of claim 1, wherein the downlink control informationparameter has, for the multicast transmission type, a first associationto a first transmission configuration indicator state index in atransmission configuration indicator state pool, which is for themulticast transmission type and the unicast transmission type, and, forthe unicast transmission type, a second association to a secondtransmission configuration indicator state index in the transmissionconfiguration indicator state pool.
 7. The method of claim 1, whereinthe downlink control information parameter identifies the transmissionconfiguration indicator state from a transmission configurationindicator state pool that is configured for the multicast transmissiontype, based at least in part on a UE-specific radio resource controlsignal.
 8. The method of claim 1, wherein the downlink controlinformation parameter identifies the transmission configurationindicator state from a transmission configuration indicator state poolthat is configured for the multicast transmission type, based at leastin part on a UE-common radio resource control signal.
 9. The method ofclaim 1, wherein a medium access control (MAC) control element (CE)parameter identifies, for the unicast transmission type and themulticast transmission type, a single set of transmission configurationindicator states of a transmission configuration indicator state poolconfigured for the multicast transmission type and the unicasttransmission type.
 10. The method of claim 1, wherein a medium accesscontrol (MAC) control element (CE) parameter identifies, for the unicasttransmission type, a first set of transmission configuration indicatorstates and, for the multicast transmission type, a second set oftransmission configuration indicator states of a transmissionconfiguration indicator state pool configured for the multicasttransmission type and the unicast transmission type.
 11. The method ofclaim 1, wherein a medium access control (MAC) control element (CE)parameter identifies the transmission configuration indicator state froma transmission configuration indicator state pool that is configured forthe multicast transmission type, based at least in part on a UE-specificradio resource control signal.
 12. The method of claim 1, wherein amedium access control (MAC) control element (CE) parameter identifiesthe transmission configuration indicator state from a transmissionconfiguration indicator state pool that is configured for the multicasttransmission type, based at least in part on a UE-common radio resourcecontrol signal.
 13. The method of claim 1, further comprising: reportinga UE capability corresponding to a maximum quantity of activetransmission configuration indicator states; and determining a set ofactive transmission configuration indicator states from which to selectthe transmission configuration indicator state, based at least in parton reporting the UE capability.
 14. The method of claim 1, whereindetermining the transmission configuration indicator state comprises:determining the transmission configuration indicator state in a currentslot based at least in part on a type of transmission for which a searchspace is configured in a previous slot.
 15. The method of claim 14,wherein determining the transmission configuration indicator statecomprises: determining the transmission configuration indicator state inthe current slot based at least in part on a control resource setquasi-co-location parameter for the previous slot.
 16. A user equipment(UE) for wireless communication, comprising: a memory; and one or moreprocessors coupled to the memory, the one or more processors configuredto: determine a transmission type for a physical downlink sharedchannel, wherein the transmission type is a multicast transmission typeor a unicast transmission type; determine, based at least in part on thetransmission type, for the physical downlink shared channel, and adownlink control information parameter, a transmission configurationindicator state, of a plurality of possible transmission configurationindicator states, that corresponds to a quasi-co-location assumption, ofa plurality of possible quasi-co-location assumptions, for the physicaldownlink shared channel; and decode the physical downlink shared channelbased at least in part on the transmission configuration indicatorstate.
 17. The UE of claim 16, wherein the one or more processors, whendetermining the transmission type, are configured to: determine thetransmission type based at least in part on: a type of scramblingidentifier for a cyclic redundancy check of the physical downlink sharedchannel, or a type of scrambling identifier for a cyclic redundancycheck of a physical downlink control channel scheduling the physicaldownlink shared channel.
 18. The UE of claim 16, wherein the downlinkcontrol information parameter is a common parameter for a controlresource set that is effective for the multicast transmission type andthe unicast transmission type.
 19. The UE of claim 16, wherein thedownlink control information parameter has, for the multicasttransmission type and the unicast transmission type, a singleassociation to a transmission configuration indicator state index in atransmission configuration indicator state pool, which is for themulticast transmission type and the unicast transmission type.
 20. Anon-transitory computer-readable medium storing a set of instructionsfor wireless communication, the set of instructions comprising: one ormore instructions that, when executed by one or more processors of auser equipment (UE), cause the UE to: determine a transmission type fora physical downlink shared channel, wherein the transmission type is amulticast transmission type or a unicast transmission type; determine,based at least in part on the transmission type, for the physicaldownlink shared channel, and a downlink control information parameter, atransmission configuration indicator state, of a plurality of possibletransmission configuration indicator states, that corresponds to aquasi-co-location assumption, of a plurality of possiblequasi-co-location assumptions, for the physical downlink shared channel;and decode the physical downlink shared channel based at least in parton the transmission configuration indicator state.